Checking machine



June 10, 1924. Y

A. V CHAMBERLIN CHECKING MACHINE Original Filed May 231. 1922 2 Sheets-Sheet 1 nueulr. Alb art M Chamber/i0 June 10 1924. 1,496,840

A. v. CHAMBERLIN CHECKING MACHINE Original Fi led May 23, 1 922 2 sheen-sheer. 2

I QIMIGHIO! Alb en. L4 Chamber/in Patented June 10, 1924..

UNETEE STATES earanr orries,

ALBERT V. CI'IAMBERLIN, OF COEUR DALENE, IDAHO.

CHECKING MACHINE.

Application filed .May 23, 1922, Serial No. 563,101.

and useful Improvements in Checking M21 tion.

My present invention relates to improvements in checking machines adapted par ticularly for use in connection with. adding machines, by accountants and others, in comparing, checking up and otherwise calculating figures. The primary'object of the invention is the provision of a machine adapted for use with a ribbon or tape bearing a column of figures that are to be checked, and by'the utilization of my invention, the figures of the column are presented,-

separately, to view, in order that they may be ascertained and noted at a glance with accuracy, by the accountant or operator of the machine. WVith this purpose in view the invention involves a machine having manually operated means for passing such a tape, step by step, therethrough to successivel disclose the figures'on the tape to the view of the operator, and the invention further consists in certain novel combinations and arrangements of parts for regulating and controlling the machine, as'will herein. after he more fully and specifically pointed out and claimed. 7

In the accompanying drawings I have illustr'ated one. complete example: of the; physical embodiment of my invention wherein the parts are combined and arranged. ac cording to the best mode I have thus far devised for the practical application of the principles of my invention, and which embodiment is in successful operation.

Figure 1 is a top plan view of a hand operated machine embodying my invention.

Figure 2 is a side elevation. of the machine of Figure 1, showing'by dotted lines the action of the machine.

'Figure. 3' is a longitudinal, vertical, sectional view, showing particularly the tape release device of the machine, at line 3-3 of Figure 1. I T

Figure 4 is a front end elevation of the machine, and Figure 5 is a rear end elevation.

Renewed February 11, 1924.

Figure 6 is a vertical, longitudinal, sectional View of the machine at line 6+6 of Figure 1. p

In the preferred form of my invention as illustrated in the drawings the machine is supported ,upon a metal base 1 rectangular in form and of convenient size, as for.in-

stance approximately eight inches by four and one half inches, and adapted to accommodate a tape T, indicated in dotted lines Figure 3, which may be of a width of two and one half inches. The tape is usually of paper with column of figures thereon applied by the action of an adding machine, and is fed step by step from the front toward the rear of the: machine and through the latter as will be described.

A suitable metal housing comprising the lower front portion 2 and higher rear portion 3 I the base 1" for the 'support of the operating parts of the machine.

Above the front housing is located a fixed top plate 1, rectangular in shape, and. fashioned with a slot 5 extending transversely of the machine, while between the top of the housing 2 and this top platev is provided a space or slot 6: through which thepaper tape eries with friction surfacesto engage the upper and lower faces respectively of the tape, and they are. revolved step by step to pass the tape from front to rear of the machine. I

The main feed roller 7 is provided with a. shaft 9 journaled in suitable bearings in the side walls of the housing 3 and extends transversely of the machine. Near one end of the shaft,- between the end of the roller and one of the walls of the housing, is fixed a pair of wheels, as an escapement rack wheel 10 and a ratchet wheel 11. The' escapement rack wheel is equipped with a is fastened in acceptable manner to detent 12 having at its end a small roller 13 to engage successive teeth of the rack Wheel as the latter revolves. The detent is pivoted at 14 in the housing wall, and a spring 15 connecting the detent with. a portion of the wall, holds the roller in frictional engagement with the escapement rack wheel 10.

The ratchet wheel 11 on the operating shaft is equipped with an operating pawl 16 which is carried by a carrier-plate 17 pivoted on the operating shaft or main shaft 9. The pawl is pivoted at 18 on this pivoted carrier plate, and the spring 19 between the pawl and plate holds the pawl in position.

for engagement with the ratchet wheel 11. Thus it will be apparent that as the carrier plate is oscillated or rocked on the shaft 9, each stroke of the carrier plate will cause engagement of the pawl with a tooth of the ratchet wheel 11 to rotate the latter with a step by step motion, the detent roller 13 per mitting only a movement of one tooth of the ratchet wheel and consequently limiting the movement of the shaft 9 and I its main roller 7.

As the main. roller is revolved through this intermittent mechanism the tape is passed between the main roller and the idler roller in the usual manner.

This intermittent movement is imparted to the rollers through the instrumentality of an operating lever 20 disposed longitudr nally of the machine and located at one side thereof, and pivotally connected with the carrier plate or rocking plate 17 by a link 21. The horizontally disposed operating lever is depressible, and is pivotally supported above the base plate by a pair of spaced pivot arms 22, 22, while a spring 23 is utilized to suspend the lever from the upper part of the rear housing 3 as shown in Figure 2. A push from the finger or thumb on the o iierating lever will depress and swing the latter slightly to the rear, as indi eated in dotted lines Figure 2, and when the thumb or finger is withdrawn, the spring 23 returns the depressed lever to normal hori zontal position.

The machine is usually supported on. a table, or desk, and may be actuated by foot movement if desired through the pedal connecting rod 24 pivoted to the operating lever 20, and in such case the rod is pulled downward by a foot-actuated pedal or treadle not shown.

The operating stroke of the lever may be regulated and limited by adjusting the vertically disposed screw 25, threaded up through the base plate 1 with its upper end beneath and in the path of movement of the operating lever.

For convenience of the operator, a second operating lever 26 may be found more aoces eeasao siblc under certain conditions. This auxiliary lever is disposed transversely of the machine above the top of the rear housing, and is pivotally supported at one end therefrom, at 27. A vertically disposed connecting rod 28 is pivoted to the auxiliary lever and passes down through the top of the rear housing. At its lower end the connecting rod is pivoted to a rock arm 29 rigidly connected with a rock shaft 30 extending transversely of the machine with its ends journaled in the walls of the housing. A spring 29 is attached to the rock arm and at the underside of the rear housing, to hold the arm in normal position, and through the arm the connecting rod and the depressible, pivoted auxiliary lever are also held in normal position.

The auxiliary operating lever is designed to co-act with the main operating lever 20, and the latter is depressed by action of the auxiliarylever through the inst-rumentality of a crank arm 31 on the rock shaft 30, and a friction roller 32 on the end of the crank arm. The crank arm is attached to the rock shaft exterior-1y of the rear housing wall and the friction roller bears against the upper face of the main operating lever at the rear end thereof. Because of the two pivotal supports of the depressible lever 20, it will be apparent that, although the crank arm exerts its force at one end of the depressible lever, the latter will be bodily depressed by action of the crank arm and roller 32, to actuate the feed rollers of the machine.

The idler roller is provided with a shaft 33 having hearings in slots 34: in the rear housing, and the roller may be withdrawn from operative relation to the main roller in order to release the tape from frictional grasp between these two rollers.

At the left side of the machine, exterior-1y of the housing 3 is located a release cam lever 35, fixed at one end of a transversely disposed cam shaft 2-56 journaled in the walls of the housing in front of and parallel with the idler roller 8. The ends of the roller shaft are movable in their slots 34: and are directly supported in a pair of bearing arms 37, one at each end of the shaft. These arms form parts of bell crank levers 38, each pivoted at 89 in a wall of the housing, and the arms are retained in uplifted position by springs to hold the idler roller in frictional contact with the under face of the main roller 7. The pressure of the idler roller against the main roller may be adjusted by varying the tension of these springs 40, and for this purpose the springs are anchored to slotted adjustable brackets ll which are secured in adjusted position i by set screws 12. Each anchoring bracket has an adjusting screw 43 threaded in a fixed bracket 44 attached to the front housing 2. It will be apparent that when the set screws 42 are loosened the tension of the springs may be changed by turning the adjusting screws 43 to move the anchoring brackets to desired position.

From the above description, taken in connection with my drawings it will be apparent that the tape with its column of figures is fed, step by step, through the machine, the figures of the column appearing successively in the observation opening 5 of the frontplate 4 in order that they may be observed accurately at a glance and checked up as required. After the figures have been checked, the release lever 35 may be swung to vertical position to withdraw the idler roller from the main roller and free the tape in order that it may be withdrawn from the machine.

Having thus fully described my invention, what I claim as new and desire to se- .cure by Letters Patent is 1. The combination in a machine as described with a pair of feed rollers and shafts therefor, of an escapement rack wheel and a driving ratchet wheel rotatable with one of said rollers, a spring actuated detent for the rack wheel, an actuating lever, a rock plate pivoted on the shaft of the latter roller, a link connecting said lever and plate, and 'a spring pressed pawl on said rock plate on gaging said ratchet wheel.

2. The combination with a driven roller and an idler roller and its shaft, of a slotted support for said shaft, a pair of bell-crank levers having journals for the ends of said shaft, springs connected with said levers, a cam shaft adapted to engage said levers, and a lever on said cam shaft for the purpose described.

3. The combination with a driven roller and an idler roller and its shaft having a slotted support, of a pair of bellcrank levers having journals for the ends of said shaft, springs connected to said levers, means for varying the tension of said springs, a cam shaft adapted to engage said levers, and a lever on said shaft for the purpose described.

4. The combination with a pair of feed rollers including an idler and its shaft having slotted supports, of a pair of bell crank levers supporting said shaft, a cam shaft and lever for operating said levers, springs connected to said bell crank levers, slotted, adjustable brackets for said springs, a fixed bracket, and set screws for adjusting said adjustable brackets.

5. The combination with apair of feed rollers, a depressible spring actuated lever, and means actuated by said lever for imparting a step by step movement to one of said rollers, of an actuating lever, a rock shaft having a crank arm to engage said depressible lever, a rock arm on the rock shaft, and a connecting rod pivoted to said rock arm and actuating lever.

In testimony whereof I affix my signature.

ALBERT V. OHAMBERLIN. 

